flag = "GXY{do_not_"
# 字符串在内存中是小端存储
s = list("7F666F6067756369")
s = [int(s[i] + s[i + 1], 16) for i in range(0, len(s), 2)][::-1]

for i, j in enumerate(s):
    if i % 2 == 1:
        flag += chr(j - 2)
    else:
        flag += chr(j - 1)
print(flag)
